You might feel that your ducts are working fine but you will not be able to judge what kind of damage accumulated dirt can to do to your duct and your family. Dirty ducts exhale unhealthy air that leads to unwanted sickness in the family or office premises. Also, if the ducts are not professionally cleaned on regular basis then the motor gets dirty and the duct has to use more energy to do its work. This results in increased electricity bills. So for the benefit of your family/employees and to save your hard-earned money, it is advisable to get your ducts professionally cleaned.